Interlayer Delamination or Cracking

Cause 1: Cooling too fast

Solution: If cooling is too rapid during printing, extruded layers won’t bond properly, leading to weak layer adhesion or even cracks. This is more pronounced with high-shrinkage materials like ABS and PA, which require an enclosed and heated environment.

1. Reduce cooling speed. Slower cooling improves interlayer bonding and strength.
2. Increase print temperature. Higher temperatures improve melt flow and layer bonding.

Cause 2:The floor height is too high

Solution: When layer height is too high, the extruded lines don’t flatten properly, resulting in poor bonding between layers.  Lower the layer height. Recommended height is 1/4 to 3/4 of the nozzle diameter, with 1/2 being ideal for balancing strength and print time.

Cause 3: Under-extrusion

Solution: Inadequate extrusion causes weak layer bonding.

1. Increase extrusion multiplier or flow rate.
2.  Raise nozzle temperature to improve material flow and extrusion volume.
3.  Replace the nozzle if it is worn and restricting flow.

Cause 4: Material has inherently low strength

Solution: Lightweight and silk-like materials have lower structural strength due to their visual and physical properties. Avoid using low-strength materials for functional or load-bearing prints.